Welding process for steel back welding mesh of commercial vehicle

Abstract

The invention discloses a commercial vehicle steel back welding mesh welding process, and relates to the technical field of welding processes. A commercial vehicle steel backing welding mesh welding technology comprises the working procedures of fine trimming treatment, spot welding fixing, pressurized discharge welding and the like, steel backing needs to be pretreated in the fine trimming treatment, so that the surfaces of different steel backing reach a unified ideal plane, and in the pressurized discharge welding process, the steel backing is not prone to deformation. The pressurization intensity of a welding electrode and time sequence parameters during welding need to be uniformly set, and meanwhile output voltage needs to be dynamically adjusted according to the electrode position of the welding electrode. Through the welding process, the balance between the welding strength and the welding height of the steel back welding net is facilitated. In addition, the invention further discloses a steel back welding mesh welding machine applied to the technology, by improving a welding electrode and cooperating with the technology, the welding flatness of the steel back welding mesh is improved, and the welding strength and the welding height of all parts of the steel back welding mesh both meet the design requirements.

Description

Technical Field

[0001] This invention relates to the technical field of welding processes, and in particular to a welding process for steel backing welded wire mesh for commercial vehicles. Background Technology

[0002] With the development of the commercial vehicle industry, commercial vehicle braking systems are gradually shifting from drum brakes to disc brakes. This development places higher demands on the performance of the steel backing of commercial vehicle disc brakes, especially in terms of strength. As a key component, the welded mesh of the steel backing directly affects its overall quality and performance due to its stability and height. A high-quality welded mesh plays a crucial role in ensuring the stability and reliability of commercial vehicle braking systems, driving the industry to continuously explore superior fixing processes for steel backing welded mesh.

[0003] Currently, in the technical field of disc brakes for commercial vehicles, welding is commonly used to fix the steel backing mesh. In actual production applications, steel backing mesh welding machines are often used for welding. Commonly used steel backing mesh welding machines are shown in the attached image. Figure 1 As shown, the system includes a welding table 1, a cylinder 3, and a welding electrode 2. The welding table 1 is used to support the workpiece to be welded, the cylinder 3 is used to drive the welding electrode 2 to press down and apply pressure to the workpiece, and the welding electrode 2 is used to cooperate with the welding table 1 to achieve pressurized discharge welding of the workpiece. However, most companies, when welding steel-backed welded wire mesh, often only focus on a single indicator, either requiring only welding strength or only focusing on the fixed height of the welded wire mesh, without requiring both to be met.

[0004] During the welding process, adjusting the welding strength or height of the steel-backed welded wire mesh mainly relies on adjusting the pressure and output voltage of the welding electrode. The tighter the pressure and the higher the output voltage, the greater the weld strength. However, this can also cause the welded mesh to collapse at the pressure points. Furthermore, in mass production, these adjustments largely depend on manual experience, lacking systematicity and precision. This easily leads to various problems in different areas of the steel-backed welded wire mesh due to varying heat dissipation rates, resulting in poor overall welding uniformity and significant height errors across different parts of the mesh. It is difficult to simultaneously meet the steel backing's dual requirements for welding strength and fixed height. Therefore, how to simultaneously meet the steel backing's requirements for welding strength and height remains a significant challenge for the industry, given the current welding technology.

[0005] In addition, during mass production, due to the different surface properties of each steel backing and the deviations formed during welding, the flatness of the steel backing is prone to irregular changes after each welding. This not only makes it difficult to ensure the consistency and stability of products in the same batch, but also results in a relatively low yield. Summary of the Invention

[0006] In order to optimize the welding process of welded wire mesh and further balance the relationship between the welding strength and the height of the welded wire mesh of the steel backing of commercial vehicle brake discs, so as to meet the design requirements at the same time and thereby improve the flatness and overall stability of the steel backing, this application provides a welding process for steel backing welded wire mesh of commercial vehicles.

[0007] Firstly, the welding process for steel back welded wire mesh for commercial vehicles provided in this application adopts the following technical solution: A welding process for steel backing mesh for commercial vehicles includes the following steps: S1. Fine finishing: The steel backing is finely finished and then shot blasted to obtain the pre-treated steel backing. S2. Spot welding fixation: Position the welded wire mesh on the surface of the pretreated steel backing and spot weld it to fix it to obtain the workpiece to be welded. S3. Pressure discharge welding: Place the workpiece to be welded on the welding table of the steel back welded mesh welding machine, adjust the equipment parameters of the steel back welded mesh welding machine, and then start the steel back welded mesh welding machine to perform pressure discharge welding on the workpiece to be welded. After the workpiece to be welded is uniformly welded, the steel back welded mesh welding is completed. The equipment parameters of the steel back welded wire mesh welding machine are set as follows: The cylinders used to drive the welding electrodes are uniformly set to apply downward and upward pressures of 0.32-0.52 MPa. The pre-pressure time of the welding electrode is uniformly set to 1-1.2s, the pressure discharge time to 0.6-0.8s, and the cooling time to 0.6-1s; The output voltage of the welding electrode is set according to the position of the welding electrode. When the position of the welding electrode changes from 142mm to 60mm, the output voltage of the welding electrode is gradually reduced from 300V to 280V; when the position of the welding electrode changes from 60mm to 260mm, the output voltage of the welding electrode is gradually increased from 280V to 310V.

[0008] By adopting the above technical solutions, the steel backing is pre-processed with fine grinding, which helps to achieve a more uniform and ideal plane on different steel backing surfaces. Combined with subsequent shot blasting, this further ensures a smooth transition of the surface contour, increasing the contact area between the steel backing and the welded mesh, and improving the welding strength of the steel backing and welded mesh. Secondly, under the premise of uniformly setting the pressure intensity of the welding electrodes and the timing parameters during welding, dynamically adjusting the output voltage according to the electrode position helps to accurately compensate for fluctuations in local heat input demand caused by differences in the steel backing structure. This effectively prevents overheating in the central area of ​​the steel backing welded mesh due to slow heat dissipation, or incomplete welding in the edge area due to rapid heat dissipation. This, in turn, improves the welding uniformity of the steel backing welded mesh, not only reducing weld height errors at different locations and ensuring that the weld height in each part meets design requirements, but also further improving the weld flatness of the steel backing welded mesh. Through the synergy of these processes, a balance can be achieved between the welding strength and weld height of the steel backing welded mesh, simultaneously meeting design requirements.

[0009] In addition, the steel back welded wire mesh welding machine with optimized equipment parameters can shorten the single welding process to within 3 seconds, which is conducive to improving the welding efficiency of a single piece of steel back welded wire mesh, shortening the welding time of a single piece of steel back welded wire mesh, and helping to increase daily output.

[0010] Optionally, the relationship between the position of the welding electrode and the output voltage is specifically set as follows: When the welding electrode is 142mm from the electrode position, the output voltage is set to 300V; When the welding electrode is 101mm from the electrode position, the output voltage is set to 300V; When the welding electrode is 60mm from the electrode position, the output voltage is set to 280V; When the welding electrode is 183mm from the electrode position, the output voltage is set to 290V; When the welding electrode is at a position of 224mm, the output voltage is set to 300V; When the welding electrode is 260mm from the electrode position, the output voltage is set to 310V.

[0011] Optionally, in step S1, the surface roughness of the pretreated steel backing is Ra4.0≤R≤Ra6.0.

[0012] By adopting the above technical solution, the contact surface area between the steel backing and the welded wire mesh can be effectively increased, which is conducive to strengthening the mechanical interlocking effect of the welding interface and improving the welding strength of the pretreated steel backing and the welded wire mesh.

[0013] Secondly, the steel-backed welded wire mesh welding machine provided in this application adopts the following technical solution: A steel back welded wire mesh welding machine includes a welding table, a welding electrode, a cylinder, and an extended electrode head. The welding electrode and the cylinder are both located directly above the welding table. The welding electrode is fixedly located at the telescopic end of the cylinder. The extended electrode head is detachably located at the end of the welding electrode away from the cylinder. The overall width of the extended electrode head is 1.8-2 times the overall width of the welding electrode.

[0014] By adopting the above technical solution and setting an extended electrode head that is wider than the overall width of traditional welding electrodes, the contact area between the welding electrode and the workpiece to be welded can be effectively increased. This not only allows the heat and pressure generated during welding to be evenly distributed, which helps to prevent a large amount of thermal stress caused by a small contact area during welding, but also helps to reduce indentation, displacement or deformation caused by pressure concentration. In addition, large-area welding also helps to improve the flatness of the welded steel backing mesh and reduce the height error of the welded mesh, thereby ensuring that the height of the welded mesh in each part meets the design requirements.

[0015] Optionally, the top of the extended electrode head is provided with a connecting groove, and one end of the welding electrode is inserted into the connecting groove. The depth of the connecting groove is 3 / 5 of the overall thickness of the extended electrode head.

[0016] By adopting the above technical solution, while ensuring that the extension electrode head has high structural strength and connection stability, the contact area between the welding electrode and the extension electrode head can be increased, which is beneficial to ensuring the conductivity efficiency and conductivity stability between the welding electrode and the extension electrode head.

[0017] Optionally, a conductive sheet is provided between the welding electrode and the extension electrode head, the thickness of the conductive sheet being 0.05-0.2 mm.

[0018] By adopting the above technical solution, the conductive sheet can effectively fill the gap between the welding electrode and the extension electrode head, so that the welding electrode and the extension electrode head can fully cooperate, which is conducive to further improving the conductivity efficiency and conductivity stability between the welding electrode and the extension electrode head.

[0019] Optionally, the conductive sheet is either a conductive copper sheet or a conductive silver sheet.

[0020] By adopting the above technical solutions, both conductive copper sheets and conductive silver sheets have excellent conductivity, which is beneficial to improving the conductivity efficiency and conductivity stability between the welding electrode and the extension electrode head.

[0021] Optionally, both the welding electrode and the extension electrode head are made of chromium-zirconium-copper material.

[0022] By adopting the above technical solution, since chromium zirconium copper material has high hardness, high wear resistance and good conductivity, it is necessary to press down and apply pressure to the welding electrode and the extension electrode head for multiple discharge welding processes. This helps to extend the service life of the welding electrode and the extension electrode head, and at the same time helps to improve the welding quality and efficiency.

[0023] Optionally, the welding electrode has a cooling water channel inside, which is used to circulate constant temperature cooling water to control the temperature of the welding electrode, and the inner wall of the cooling water channel is provided with an insulating layer.

[0024] By adopting the above technical solutions, the rapid wear and tear of the welding electrode due to repeated discharge welding and slow heat dissipation can be effectively prevented, thus extending the service life of the welding electrode. Furthermore, the installation of an insulating layer on the inner wall of the cooling water channel effectively prevents current from being conducted to other external equipment through the cooling water during discharge welding, thereby improving equipment safety.

[0025] Optionally, the surface of the welding station is provided with a conductive protective sheet, the thickness of which is 0.2mm≤h≤0.5mm.

[0026] By adopting the above technical solution, the conductive protective sheet can not only protect the welding station from being scratched by the frequently moved workpiece, thus extending the service life of the welding station, but also ensure that the welding electrode and the welding station can cooperate smoothly and achieve pressurized discharge welding.

[0027] In summary, the technical solution of this application possesses at least one of the following beneficial effects: 1. Through the coordinated processes of fine finishing, spot welding and pressure discharge welding, it is beneficial to balance the relationship between the welding strength and height of the steel back welded mesh, so that it can meet the design requirements at the same time.

[0028] 2. By pre-processing and polishing the steel backing, it is beneficial to achieve a more uniform and ideal plane on different steel backing surfaces. Combined with subsequent shot blasting, it can further ensure a smooth transition of the surface contour, which helps to increase the contact surface area between the steel backing and the welded wire mesh and improve the welding strength of the steel backing and the welded wire mesh.

[0029] 3. By dynamically adjusting the output voltage according to the electrode position of the welding electrode under the premise of uniformly setting the pressure intensity of the welding electrode and the timing parameters during welding, it is beneficial to accurately compensate for the fluctuation of local heat input demand caused by the differences in the steel backing structure. This can effectively prevent the problem of overheating in the central area of ​​the steel backing welded mesh due to slow heat dissipation, or the problem of incomplete welding in the edge area due to fast heat dissipation. This is beneficial to improve the welding uniformity of the steel backing welded mesh, which not only helps to reduce the height error of the welded mesh at different positions of the steel backing welded mesh, so that the height of the welded mesh in each part meets the design requirements, but also further improves the welding flatness of the steel backing welded mesh.

[0030] 4. By setting an extended electrode head that is wider than the overall width of traditional welding electrodes, the contact area between the welding electrode and the workpiece to be welded can be effectively increased. This not only makes the heat and pressure generated during welding more evenly distributed, which helps to prevent a large amount of thermal stress caused by a small contact area during welding, but also helps to reduce indentation, displacement or deformation caused by pressure concentration. In addition, large-area welding also helps to improve the flatness of the steel back welded mesh, reduce the height error of the welded mesh, and make the height of the welded mesh in each part meet the design requirements. Attached Figure Description

[0031] Figure 1 This is a partial schematic diagram of an existing steel back welded wire mesh welding machine.

[0032] Figure 2 This is a process flow diagram of a steel back welded wire mesh welding process for commercial vehicles, as described in Embodiment 1 of this application.

[0033] Figure 3 This is a structural schematic diagram of a steel back welded wire mesh welding machine according to Embodiment 2 of this application.

[0034] Figure 4 yes Figure 3 A magnified view of part a in the middle.

[0035] Figure 5 This is a cross-sectional view of the welding electrode of a steel back welded wire mesh welding machine according to Embodiment 2 of this application.

[0036] Explanation of reference numerals in the attached figures: 1. Welding station; 11. Conductive protective sheet; 2. Welding electrode; 21. Cooling water channel; 3. Cylinder; 4. Extended electrode head; 41. Connecting groove; 42. Connecting bolt; 43. Conductive sheet. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-5 The present application will be further described in detail with reference to the embodiments.

[0038] An existing steel back welded wire mesh welding machine, referring to Figure 1A steel back welded wire mesh welding machine includes a welding table 1, a welding electrode 2, and a cylinder 3. The welding table 1 is used to support the workpiece to be welded. The welding electrode 2 and the cylinder 3 are both located directly above the welding table 1. The welding electrode 2 is fixedly located at the telescopic end of the cylinder 3. The cylinder 3 is used to drive the welding electrode 2 to press down and apply pressure to the workpiece to be welded. The welding electrode 2 is used to cooperate with the welding table 1 to realize pressurized discharge welding of the workpiece to be welded.

[0039] Specifically, both the welding electrode 2 and the welding station 1 are made of chromium zirconium copper material. The overall length of the welding electrode 2 is 200mm and the overall width is 20mm.

[0040] Example 1 Embodiment 1 of this application discloses a welding process for steel backing welded wire mesh in commercial vehicles. (Refer to...) Figure 1 and Figure 2 A process for welding steel backing mesh for commercial vehicles includes the following steps: S1. Fine finishing: The steel backing is finely finished and then shot blasted to obtain pre-treated steel, wherein the surface roughness of the pre-treated steel backing is R=Ra4.0.

[0041] S2. Spot welding fixation: Position the welded wire mesh on the surface of the pretreated steel backing, and spot weld it at any four points in the middle of the welded wire mesh. The spot welding voltage is set to 190V to obtain the workpiece to be welded.

[0042] S3. Pressure discharge welding: Place the workpiece to be welded on the welding table 1 of the steel back welded mesh welding machine, adjust the equipment parameters of the steel back welded mesh welding machine, and then start the steel back welded mesh welding machine to perform pressure discharge welding on the workpiece to be welded. After the workpiece to be welded is uniformly welded, the steel back welded mesh welding is completed.

[0043] In the pressurized discharge welding process, the equipment parameters of the steel back welded wire mesh welding machine are set as follows: The cylinder 3 is uniformly set to drive the welding electrode 2 with both the downward pressure and the applied pressure of 0.42 MPa; The pre-pressure time of welding electrode 2 is uniformly set to 1.1s, the pressure discharge time to 0.8s, and the cooling time to 0.6s.

[0044] The pressing time is the time from when the cylinder 3 drives the welding electrode 2 to press down until it contacts the workpiece to be welded and reaches the applied pressure. The pressure discharge time is the time when the welding electrode 2 applies pressure to the workpiece to be welded and performs discharge welding in conjunction with the welding table 1. The cooling time is the time from when the welding electrode 2 finishes discharging until the welding electrode 2 is removed from the product. During the cooling time, the welding electrode 2 needs to maintain the applied pressure and allow the surface of the workpiece to cool naturally.

[0045] When performing pressurized discharge welding on welding electrode 2, the output voltage of welding electrode 2 needs to be set according to the position of welding electrode 2, specifically as follows: When welding electrode 2 is 142mm from the electrode position, the output voltage is set to 300V; When welding electrode 2 is 101mm from the electrode position, the output voltage is set to 300V; When welding electrode 2 is 60mm from the electrode position, the output voltage is set to 280V; When welding electrode 2 is 183mm from the electrode position, the output voltage is set to 300V; When welding electrode 2 is at an electrode position of 224mm, the output voltage is set to 290V; When welding electrode 2 is at an electrode position of 260mm, the output voltage is set to 310V.

[0046] The electrode position refers to the straight-line distance between the pressing position of the welding electrode 2 and the central axis of the steel back welded mesh when the welding electrode 2 presses down on the workpiece to be welded.

[0047] By adopting the steel-backed welded wire mesh welding process disclosed in this embodiment for commercial vehicles, and in conjunction with an existing steel-backed welded wire mesh welding machine, the welding strength of the steel-backed welded wire mesh was tested to have a single-point pull-out force of 240N-260N, and the welding height was within the tolerance range of 2.0-3.0mm.

[0048] The implementation principle of the steel back welded wire mesh welding process for commercial vehicles in Embodiment 1 of this application is as follows: By rationally setting the welding process of steel-backed welded wire mesh and pre-processing the steel backing with fine grinding, the initial deformation of the steel backing blank can be effectively eliminated and its contour can be directly corrected. This helps to make different steel backing surfaces reach a more uniform ideal plane. The subsequent shot blasting process can actively eliminate the micro burrs or edge undulations generated by fine grinding, further ensuring a smooth transition of its surface contour. This helps to increase the contact surface area between the steel backing and the welded wire mesh and improve the welding strength of the steel backing and the welded wire mesh.

[0049] Secondly, under the premise of uniformly setting the pressure intensity of welding electrode 2 and the timing parameters during welding, dynamically adjusting the output voltage according to the electrode position of welding electrode 2 is beneficial to accurately compensate for the fluctuation of local heat input demand caused by the differences in the steel back structure. It is also beneficial to prevent overheating in the central area of ​​the steel back welded mesh due to slow heat dissipation, or incomplete welding in the edge area due to rapid heat dissipation. This achieves uniformity and optimization of heat distribution across the entire welded mesh surface, which is beneficial to improving the welding uniformity of the steel back welded mesh. It not only reduces the height error of the welded mesh at different positions, ensuring that the height of the welded mesh in each part meets the design requirements, but also further improves the welding flatness of the steel back welded mesh. Through the cooperation of the above processes, the relationship between the welding strength and the height of the steel back welded mesh can be effectively balanced, so that the design requirements can be met simultaneously.

[0050] In addition, the steel back welded wire mesh welding machine with optimized equipment parameters can shorten the single welding process to within 3 seconds, which is conducive to improving the welding efficiency of a single piece of steel back welded wire mesh, shortening the welding time of a single piece of steel back welded wire mesh, and helping to increase daily output.

[0051] Example 2 Embodiment 2 of this application discloses a steel-backed welded wire mesh welding machine, referring to... Figure 3 and Figure 4 The difference between this and the existing steel back welded mesh welding machine lies in the different welding electrode 2 and welding table 1.

[0052] In this embodiment, refer to Figure 3 and Figure 4 The welding electrode 2 is detachably equipped with an extension electrode head 4 at one end used for electrical discharge welding. Specifically, the top of the extension electrode head 4 is provided with a connecting groove 41, the end of the welding electrode 2 used for electrical discharge welding is inserted into the connecting groove 41, and a connecting bolt 42 is provided on the side of the extension electrode head 4, so that the extension electrode head 4 is detachably connected to the welding electrode 2 through the connecting bolt 42.

[0053] Specifically, the extended electrode head 4 is also made of chromium-zirconium-copper material. The overall length of the extended electrode head 4 matches that of the welding electrode 2, both being 200mm. The overall width of the extended electrode head 4 is set to 1.8-2 times the overall width of the welding electrode 2, so as to increase the contact area with the workpiece to be welded while ensuring that the extended electrode head 4 has high structural strength and extends its service life. In this embodiment, the overall width of the extended electrode head 4 is specifically 39mm. The overall thickness of the extended electrode head 4 is 25mm, and the depth of the connecting groove 41 is 15mm, that is, the welding electrode 2 is inserted into the extended electrode head 4 at 3 / 5 of its length. This ensures the structural strength of the extended electrode head 4, while appropriately increasing the contact area between the welding electrode 2 and the extended electrode head 4, ensuring the conductivity efficiency and conductivity stability between the welding electrode 2 and the extended electrode head 4.

[0054] Reference Figure 3 and Figure 4 Furthermore, a conductive sheet 43 is provided between the welding electrode 2 and the extension electrode head 4. The conductive sheet 43 is made of conductive metal and fills the gap between the welding electrode 2 and the extension electrode head 4, allowing for an interference fit and further improving the conductivity efficiency and stability between them. Specifically, the conductive sheet 43 can be any type of conductive silver sheet, with a thickness of 0.05-0.2 mm. In this embodiment, a conductive silver sheet with a thickness of 0.1 mm is specifically selected.

[0055] Reference Figure 5 The welding electrode 2 has a cooling water channel 21 inside, which circulates constant-temperature cooling water to control the temperature of the welding electrode 2. This ensures that the welding electrode 2 maintains a temperature of 22-28℃ after multiple welding operations, thus preventing excessive wear and extending its service life. Furthermore, the inner wall of the cooling water channel 21 is provided with an insulating layer to prevent the welding electrode 2 from conducting electricity to other external devices through the cooling water in the cooling water channel 21 during discharge welding, thereby improving equipment safety.

[0056] Reference Figure 3 Furthermore, a conductive protective sheet 11 is provided on the surface of the welding station 1. The conductive protective sheet 11 is used to protect the welding station 1 from being scratched by the frequently moved workpiece to be welded, and at the same time ensures that the welding electrode 2 and the welding station 1 can cooperate smoothly to achieve pressure discharge welding. Specifically, the conductive protective sheet 11 is also made of conductive metal with a thickness of 0.2mm≤h≤0.5mm. Since the area of ​​the welding station 1 is large, in this embodiment, a conductive copper sheet with a thickness of 0.2mm is specifically selected for the conductive protective sheet 11.

[0057] Embodiment 2 of this application also discloses a steel back welded wire mesh welding process for commercial vehicles. The difference from Embodiment 1 is that the steel back welded wire mesh welding machine used in step S3 is the steel back welded wire mesh welding machine disclosed above.

[0058] By adopting the steel-backed welded wire mesh welding process for commercial vehicles disclosed in this embodiment, and in conjunction with the steel-backed welded wire mesh welding machine disclosed in this embodiment, the welding strength of the steel-backed welded wire mesh was tested to have a single-point pull-out force of 250N-280N, and the welding height was within the tolerance range of 2.0-2.3mm.

[0059] The implementation principle of the steel back welded wire mesh welding process for commercial vehicles in Embodiment 2 of this application is as follows: By improving the welding electrode 2 of the steel back welded wire mesh welding machine, the extended electrode head 4 can effectively increase the contact area between the welding electrode 2 and the workpiece to be welded. This not only makes the heat and pressure generated during welding more evenly distributed, but also helps to prevent a large amount of thermal stress caused by a small contact area during welding. It also helps to reduce indentation, displacement or deformation caused by pressure concentration. In addition, large-area welding also helps to improve the flatness of the steel back welded wire mesh and reduce the height error of the welded wire mesh, so that the height of the welded wire mesh in each part meets the design requirements.

[0060] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this specific embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A welding process for steel-backed welded wire mesh for commercial vehicles, characterized in that, Includes the following steps: S1. Fine finishing: The steel backing is finely finished and then shot blasted to obtain the pre-treated steel backing. S2. Spot welding fixation: Position the welded wire mesh on the surface of the pretreated steel backing and spot weld it to fix it to obtain the workpiece to be welded. S3. Pressure discharge welding: Place the workpiece to be welded on the welding table (1) of the steel back welded mesh welding machine, adjust the equipment parameters of the steel back welded mesh welding machine, and then start the steel back welded mesh welding machine to perform pressure discharge welding on the workpiece to be welded. After the workpiece to be welded is uniformly welded, the steel back welded mesh welding is completed. In the pressurized discharge welding process, the equipment parameters of the steel back welded wire mesh welding machine are set as follows: The cylinder (3) is uniformly set to drive the welding electrode (2) with a downward pressure and an upward pressure of 0.32-0.52 MPa. The pre-pressing time of the welding electrode (2) is uniformly set to 1-1.2s, the pressurized discharge time to 0.6-0.8s, and the cooling time to 0.6-1s; The output voltage of the welding electrode (2) is set according to the position of the welding electrode (2). When the position of the welding electrode (2) changes from 142mm to 60mm, the output voltage of the welding electrode (2) is gradually reduced from 300V to 280V; when the position of the welding electrode (2) changes from 60mm to 260mm, the output voltage of the welding electrode (2) is gradually increased from 280V to 310V.

2. The welding process for steel backing mesh for commercial vehicles according to claim 1, characterized in that: The relationship between the position of the welding electrode (2) and the output voltage is specifically set as follows: When the welding electrode (2) is 142mm from the electrode position, the output voltage is set to 300V; When the welding electrode (2) is 101mm from the electrode position, the output voltage is set to 300V; When the welding electrode (2) is 60mm from the electrode position, the output voltage is set to 280V; When the welding electrode (2) is 183mm from the electrode position, the output voltage is set to 290V; When the welding electrode (2) is 224mm from the electrode position, the output voltage is set to 300V; When the welding electrode (2) is 260mm from the electrode position, the output voltage is set to 310V.

3. The welding process for steel backing mesh for commercial vehicles according to claim 1, characterized in that: In step S1, the surface roughness of the pretreated steel backing is Ra4.0≤R≤Ra6.

0.

4. A steel-backed welded wire mesh welding machine, applied in a steel-backed welded wire mesh welding process for commercial vehicles as described in any one of claims 1-3, characterized in that: The assembly includes a welding table (1), a welding electrode (2), a cylinder (3), and an extension electrode head (4). The welding electrode (2) and the cylinder (3) are both located directly above the welding table (1). The welding electrode (2) is fixedly located at the telescopic end of the cylinder (3). The extension electrode head (4) is detachably located at the end of the welding electrode (2) away from the cylinder (3). The overall width of the extension electrode head (4) is 1.8-2 times the overall width of the welding electrode (2).

5. A steel-backed welded wire mesh welding machine according to claim 4, characterized in that: The top of the extended electrode head (4) is provided with a connecting groove (41), and one end of the welding electrode (2) is inserted into the connecting groove (41). The depth of the connecting groove (41) is 3 / 5 of the overall thickness of the extended electrode head (4).

6. A steel-backed welded wire mesh welding machine according to claim 4, characterized in that: A conductive sheet (43) is provided between the welding electrode (2) and the extension electrode head (4), and the thickness of the conductive sheet (43) is 0.05-0.2 mm.

7. A steel-backed welded wire mesh welding machine according to claim 6, characterized in that: The conductive sheet (43) is either a conductive copper sheet or a conductive silver sheet.

8. A steel-backed welded wire mesh welding machine according to claim 4, characterized in that: Both the welding electrode (2) and the extension electrode head (4) are made of chromium zirconium copper material.

9. A steel-backed welded wire mesh welding machine according to claim 4, characterized in that: The welding electrode (2) has a cooling water channel (21) inside. The cooling water channel (21) is used to circulate constant temperature cooling water to control the temperature of the welding electrode (2). The inner wall of the cooling water channel (21) is provided with an insulating layer.

10. A steel-backed welded wire mesh welding machine according to claim 4, characterized in that: The surface of the welding station (1) is provided with a conductive protective sheet (11), the thickness of which is 0.2mm≤h≤0.5mm.

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